MOCO02
IAP/RAS, Nizhny Novgorod, Russia
UNN, Nizhny Novgorod, Russia
JYFL, Jyväskylä, Finland
*A.G. Shalashov et all, JETP Letters, 2006, Vol. 84, No. 6, pp. 314-319 (2006)
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MOCO02 |
Broadband Microwave Emission Spectrum Associated With Kinetic Instabilities in ECR Plasmas | |
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ECRISs are susceptible to kinetic instabilities due to resonance heating mechanism forming an anisotropic electron velocity distribution function. Well-known and frequently observed extracted ion beam current oscillations in case of high heating power and/or low magnetic field gradient are proven to be caused by the instabilities of cyclotron type leading to a notable reduction of highly-charged ion beam intensities. It has been shown recently that heating power level and magnetic field gradient affect the spectrum of microwave emission of plasma related to cyclotron instabilities, being in the frequency range of 8-14 Ghz. More detailed study of microwave emission spectrum of ECR plasma conducted with an improved setup is presented in this work. It was found that frequencies of microwaves emitted by the plasma can be far beyond the primary heating frequency (14 GHz) and up to 25 GHz. Moreover, a threshold transition from periodic pulsed emission to a CW emission has been observed in the experiment for the first time, as was predicted theoretically*. The transition occurs at certain threshold levels of heating microwave power and magnetic field gradient.
*A.G. Shalashov et all, JETP Letters, 2006, Vol. 84, No. 6, pp. 314-319 (2006) |
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Slides MOCO02 [48.375 MB] | |
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